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Mello
 3 years ago
Geometry~!
Mello
 3 years ago
Geometry~!

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phi
 3 years ago
Best ResponseYou've already chosen the best response.0is ABCD a parallelogram or a rhombus?

tamtoan
 3 years ago
Best ResponseYou've already chosen the best response.1the figure is not drawn to scale, so it's harder to see let me draw again and you can check to see if i am right. dw:1355076484153:dw

tamtoan
 3 years ago
Best ResponseYou've already chosen the best response.1BD is perpendicular to AC since they are diagonals of a rhombus look at triangle ABD, the area is ABxDH = BDx(AC/2) since AC/2 = DH ==> AB = BD and since AB = AD also, (rhombus), triangle ABD have 3 sides equal, (they are called equalateral triangle right?), each angle is 60 degree so angle ABC = 2x60 = 120
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